AsyncFileUpload resize

We have an asp.net page with the AsyncFileUpload control to do immediate uploads of a selected file(s) and it works perfectly.  However, the users now want to have the file resized before it is saved/uploaded.  We are using the following code-behind to save the uploaded file to a specific location.  After that code is a Resize_Image function that we use for resizing an image from a stream and then saving the resized image.  How can I get the code-behind to create a stream for the upload?

    Protected Sub UploadedComplete(ByVal sender As Object, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs) Handles AsyncFileUpload1.UploadedComplete
        Dim filePath As String = txtFolderPath.Text
        Dim fi As FileInfo = New FileInfo(filePath)

        filePath = Replace(filePath, "\", "\\")
        filePath = Replace(filePath, "\\\\", "\\")
        Dim fiu As FileInfo = New FileInfo(AsyncFileUpload1.PostedFile.FileName)
        If ckJobIDPhoto.Checked Then
            filePath &= "\\Job ID Photo" & fiu.Name & "." & fiu.Extension
            ckJobIDPhoto.Checked = False
        Else
            filePath &= "\\" & txtPhotoPrefix.Text & fiu.Name & "." & fiu.Extension
        End If
        filePath = Replace(filePath, "..jpg", "")
        txtMsg.Text = filePath
        AsyncFileUpload1.SaveAs(filePath)
    End Sub



    Public Shared Function Resize_Image(ByVal streamImage As Stream, ByVal maxWidth As Integer, ByVal maxHeight As Integer) As Bitmap

        Dim originalImage As New Bitmap(streamImage)
        Dim newWidth As Integer = originalImage.Width
        Dim newHeight As Integer = originalImage.Height
        Dim aspectRatio As Double = CDbl(originalImage.Width) / CDbl(originalImage.Height)

        If aspectRatio <= 1 AndAlso originalImage.Width > maxWidth Then
            newWidth = maxWidth
            newHeight = CInt(Math.Round(newWidth / aspectRatio))
        ElseIf aspectRatio > 1 AndAlso originalImage.Height > maxHeight Then
            newHeight = maxHeight
            newWidth = CInt(Math.Round(newHeight * aspectRatio))
        End If

        Return New Bitmap(originalImage, newWidth, newHeight)

    End Function